When the left shoulder tendon strain appears to be swollen hand heat, may be related to vascular dilatation, venous stasis and other factors. 1. Vascular dilatation: When the left shoulder tendon strain occurs, the blood vessels around the left shoulder will be dilated, which will increase the blood supply to the arteries, thus leading to an increase in the local heat, and the heat will be transmitted to the hands, and the symptom of swollen and hot hands will occur. 2. Venous stasis: When the left shoulder tendon strain occurs, it will make the local swelling, press the vein, causing venous return obstruction, which will lead to venous stasis, and will also cause shoulder swelling and hand fever symptoms. If the left shoulder tendon strain swelling and hand fever persists and can not be relieved, it is necessary to go to the hospital in a timely manner to improve the MRI, CT, DR and other examinations, to clarify the cause of the disease, and follow the doctor’s instructions for treatment.